It finally happened. One morning I find the rear tire flat due to a nail puncture. Not a problem, I used my portable air compressor to fill the tire just enough to make it to the tire shop. Although I had all the needed tools with me, I really hate the job of depressing the tire from the wheel.

At the end, they filled the tire with air and I decided to use my own gauge to check pressure. Was showing 0. Check again, still 0. Was it broken? No, those guys pumped some 10 bar (instead of normal 2.5), so the gauge needle was actually going beyond the range and back to 0!